Make the Mailchimp Subscriber popup appear on click

clickable-element.html

<!-- This is the HTML element that, when clicked, will cause the popup to appear. -->

<button id="open-popup">Subscribe to our mailing list</button>

mailchimp_popup.js

<script type="text/javascript" src="//s3.amazonaws.com/downloads.mailchimp.com/js/signup-forms/popup/embed.js" data-dojo-config="usePlainJson: true, isDebug: false"></script>

<script>
function showMailingPopUp() {
    require(["mojo/signup-forms/Loader"], function(L) { L.start({"baseUrl":"mc.us11.list-manage.com","uuid":"YOUR_UUID_GOES_HERE","lid":"YOUR_LID_GOES_HERE"}) })
    document.cookie = "MCEvilPopupClosed=; expires=Thu, 01 Jan 1970 00:00:00 UTC";
};

document.getElementById("open-popup").onclick = function() {showMailingPopUp()};
</script>